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- Why is a cohort design more efficient than a case-control design to study a rare exposure? (Select one best answer) Group of answer choices a. Subjects are selected based on their exposure status. b. Subjects are selected based on their disease status. c. Subjects are selected based on their exposure and disease status. d. Subjects are selected based on their random allocation to treatment or placebo. e. None of these.6) A researcher is interested in whether women like Justin Bieber's music more than men. The extent to which people liked Bieber's music was measured on a 10 point scale ranging from 1 = do not like at all, to 10 like Justin Bieber's music more than men (alpha = .05). very much like. Using the data below, please determine whether women Women Men 7 4 8 7 4 a) What type statistical analysis should you perform? Please explain your rationale b) Please state the null and alternative hypotheses c) Please write out the results (t-value, df, p-value) and make a decision d) Please make a general conclusion (no stats talk)е. Sample region 6. Question: In a hypothesis test, what does the values of T(0) signify? a. Smallest level of significance for rejection of Null Hypothesis. b. Largest level of significance for rejection of Null Hypothesis. c. Smallest level of significance for acceptance of Null Hypothesis d. Largest level of significance for acceptance of Null Hypothesis 3
- 3. A researcher samples 5 colony of Species of K and 5 colonies of Species L, measures their sizes as: Species K Species L 4.7 5.3 5.2 4.6 6.1 4.1 5.8 4.8 5.2 4.2 а. Test if mean colony size of Species K and Species L are different from each other? Report a p-value. (You mav need to do an additional test to decide which test to apply for comparing the means) b. What is the power of the test in part a? С. The researcher would like to design a new experiment which will allow a two tailed hypothesis test with significance 0.05 and power 0.90. What should be the sample sizes nk and ni for Species K and Species L (use k = 1). %3D← Jamison Kovach Supply Company manufactures paper clips and other office products. Although inexpensive, paper clips have provided the firm with a high margin of profitability. Sample size is 200. Results are given for the last 10 samples. Sample Defectives 1 UCL 5 = 2 7 3 2 4 6 5 6 6 5 b) Has the process been in control? Based on the developed control limits, the number of defectives has been IN-CONTROL c) If the sample size were 100 instead, how would your limits and conclusions change? 7 5 The type of control chart that is best to monitor this process is p-chart a) Establish the control limits to include 99.73% of the random variation in defectives. UCL, = 0.059 (enter your response as a number between 0 and 1, rounded to three decimal places) LCLp = 0 (enter your response as a number between 0 and 1, rounded to three decimal places) 8 5 9 2 (enter your response as a number between 0 and 1, rounded to three decimal places) 10 1139. You are interested in further investigating whether there is a causal relationship between stress and sleep quality. а. What type of study design will you choose? Select one: (a) Experimental (b) Quasi-experimental (c) Non-experimental Select one: (a) Retrospective (b) Prospective (c) Cross-sectional Select one: (a) Case-Control (b) Cohort (c) Ecologic (d) Randomized Controlled Trial b. Provide a justification for your selections: c. Identify at least one potential confounding variable. Explain why it may be a confounder and how you might control for it. 40. Answer the following questions regarding sampling method and its relationship to validity. а. What type of sampling method is convenience sampling? Type of sampling method: (a) Probability (b) Non-probability b. How would using a convenience sample affect the external validity of your study? c. How would using a convenience sample affect the internal validity of your study? С.
- Consider a researcher who is exploring new potential treatments for specific forms of cancer. This researcher is extremely focused on avoiding mistakes in concluding that treatments that may very well be effective are ineffective when conducting their research. What should this researcher do? a. set a higher alpha level b. set a higher sample mean c. set a lower alpha level d. set a lower sample mean5. The ABC University wants to know the proportion of its football fans travel to away games in the same state. The university took a random sample of 2000 of its football fans and found that 500 of them travel to away games in the state. • Identify the population for this situation. What is the parameter? What is the sample? • Identify the sample statistic. Can the university estimate the population proportion based on the sample? Explain your answer.Another disease. Suppose a test for a disease has a sensitivity of 75% and a specificity of 85%. Further suppose that in a certain country with a population of 1,000,000, 20% of the population has the disease. a. Fill in the accompanying table. Does not have Has disease disease Totals Test positive Test negative Totals b. What are the PPV and NPV of this test for this country?
- When a researcher uses random sampling in their study, they are most likely concerned with: When a researcher uses random sampling in their study, they are most likely concerned with: a.Increasing the internal validity of the study by creating a representative sample. b. Increasing the external validity of the study by creating a representative sample. c. Increasing the external validity of the study by reducing the potential for confounding variables. d. Increasing the internal validity of the study by reducing the potential for confounding variables.Under what circumstances is it advisable to switch to a between-subjects design instead of using a within-subjects design?Gmail Google Bb Blackboard Learn Bb Course Documents... dy & Practice Austin Community... 9 The Art Of Public S.. Assignment Gradebook NSHSS James W. Le... ORION Downloadable eTextbook en Assignment Reading list Chapter 6, Section 3-D, Exercise 135 FULL SCREEN PRINTER VERSION 4 ВАСK NEXT Consider random samples of size 42 drawn from population A with proportion 0.32 and random samples of size 38 drawn from population B with proportion 0.21. on 3- on 3- x Incorrect. on 3- - PB: (a) Find the standard error of the distribution of differences in sample proportions, pA -. on 3- Round your answer for the standard error to three decimal places. on 3- on 3- 0.106 standard error = on 3- the absolute tolerance is +/-0.001 on 3- SHOW HINT on 3- Fon 3- LINK TO TEXT тon 3- ion 3- Your answer is correct. 12:14 AM ion 3- 9. APA 5/4/2021 (b) Are the sample sizes large enough for the Central Limit Theorem to apply? W 口 A e here to search delete insert home F11 end F12 prt sc F10 P.